Display Device Detection Electrode Pitch Moiré Suppression
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Solution Overview
Problem
Display devices with detection electrodes overlapping the display area suffer from interference with pixels, leading to moiré patterns due to the conductive lines, which affect image quality and visibility.
Innovation Solution
The display device employs a specific pixel layout where subpixels are arranged with a pitch and angle configuration that minimizes interference with detection electrodes, using a mesh-like electrode pattern with conductive lines inclined at certain angles and pitches within a specific range to prevent moiré formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If detection electrodes are arranged to overlap the display area, then object detection function is achieved, but moiré patterns occur due to interference with pixels
Solution Approach 1:
The patent changes the spatial parameters of the detection electrode pattern, specifically setting the pitch to be 2.2 to 3.2 times the pixel pitch and orienting it at 15 to 75 degrees relative to the pixel arrangement. This parameter optimization suppresses moiré patterns while maintaining the object detection function.
Solution Approach 2:
The detection electrode pattern is designed with asymmetric orientation angles (15 to 75 degrees) relative to the pixel grid, breaking the symmetry that causes moiré interference. This asymmetric arrangement disrupts the regular interference pattern between electrodes and pixels.
2Ease of manufacture
If conductive lines are arranged in a regular grid pattern, then manufacturing is simplified, but interference with pixels causes moiré formation
Solution Approach 1:
The patent modifies the grid parameters by introducing specific pitch ratios (2.2-3.2 times pixel pitch) and orientation angles (15-75 degrees), transforming the regular grid into an optimized pattern that reduces moiré while remaining manufacturable through standard photolithography processes.
3Measurement precision
If detection electrode pitch is reduced to improve resolution, then detection precision increases, but moiré patterns become more pronounced
Solution Approach 1:
The patent establishes an optimal pitch range (2.2-3.2 times pixel pitch) that balances detection precision with moiré suppression. This parameter optimization ensures sufficient detection resolution while avoiding the moiré patterns that would result from smaller pitch values.
Data Source
AI summary
According to one embodiment, a display device includes a display area with pixels, and a detection electrode which includes first conductive lines overlapping the display area. Each of the pixels includes a first subpixel, a second subpixel adjacent to the first subpixel in a first direction, a third subpixel adjacent to the first subpixel in a second direction, and a fourth subpixel adjacent to the third subpixel in the first direction and to the second subpixel in the second direction. The pixels are arranged in the first direction with a first pitch, and the first conductive lines are arranged in the first direction with a second pitch which falls within a range of 2.2 times the first pitch or more and 3.2 times the first pitch or less.